CN111337536A - Liquid drop stream radiation heat exchange experimental device and method - Google Patents
Liquid drop stream radiation heat exchange experimental device and method Download PDFInfo
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Abstract
A liquid drop stream radiation heat exchange experimental device and a method are used for experimental study of radiation heat exchange characteristics of liquid drop streams in a low-temperature vacuum environment, and the experimental device comprises a low-temperature environment simulation system, a liquid drop stream generation system and a temperature measurement system; the low-temperature environment simulation system is used for reducing the temperature of the test section and enhancing the heat exchange of the liquid drop flow under the action of heat radiation; the droplet flow generating system is used for generating droplet flows with different diameters, initial speeds and droplet number densities according to the requirements of experimental working conditions; the temperature measurement system is used for measuring the temperature of the droplet flow under different experimental working conditions, so that the heat exchange characteristics of the droplet flow are analyzed.
Description
Technical Field
The invention relates to the technical field of droplet flow radiation heat exchange, in particular to a droplet flow radiation heat exchange experimental device and a droplet flow radiation heat exchange experimental method.
Background
The development of a novel thermal control system is one of the important subjects of spacecraft design and research. In order to overcome the defects of large mass, low heat exchange efficiency and the like of the traditional solid surface radiation heat dissipation systems such as a heat pipe type heat exchanger, a loop type heat exchanger and the like, a liquid drop radiator is proposed as a light and efficient space heat exchange device and is widely researched. At present, a great deal of numerical simulation research is carried out on the radiation heat exchange characteristics of the droplet radiator, and experimental research is also carried out on the generation and collection of uniform droplet flow, but the radiation heat exchange experimental research of the droplet flow is not yet carried out.
Disclosure of Invention
The invention aims to provide a liquid drop stream radiation heat exchange experimental device and a liquid drop stream radiation heat exchange experimental method, and provides the experimental device and the method for researching the radiation heat exchange characteristics of liquid drop streams under the low-temperature vacuum condition.
In order to achieve the purpose, the invention adopts the following technical scheme:
a liquid drop stream radiation heat exchange experimental device comprises a low-temperature environment simulation system, a liquid drop stream generation system and a temperature measurement system; the low-temperature environment simulation system comprises a main body, a coil pipe 5 is laid on the outer wall of a cylinder 6, liquid nitrogen is contained in the coil pipe 5 as a coolant, and heat insulation cotton 9 wraps the outer wall of the cylinder 6 and the periphery of the coil pipe 5; the low-temperature environment simulation system also comprises an air compressor 1, an air storage tank 20, an oil separator 2, a pressure reducer 3 and a liquid nitrogen tank 4 which are sequentially connected with the air compressor 1, wherein the liquid nitrogen tank 4 is communicated with the coiled pipe 5; the liquid drop flow generating system comprises a high-level liquid tank 16 for storing liquid drop working media, and a high-pressure nitrogen cylinder 12 communicated with the high-level liquid tank 16 through a first valve 13, wherein a second valve 21 is arranged at the outlet of the high-level liquid tank 16, a pipeline behind the second valve 21 is divided into two paths, one path is communicated with a cylinder 6, the other path is communicated with a water tank 17, a third valve 22 and a piezoelectric ceramic 8 are arranged at the communication position of the cylinder 6 and the high-level liquid tank 16, a power amplifier 10 and a signal generator 11 are connected with the piezoelectric ceramic 8, a liquid drop outlet at the bottom of the cylinder 6 is communicated with the water tank 17, and a heating wire 15 and a temperature and pressure monitoring device 14 are arranged in the high; the liquid drop working medium is pressurized by high-pressure nitrogen, and the liquid drop flow 18 flows out of the cylinder 6 and is collected into a water tank 17; the temperature measurement system comprises a thermal infrared imager 7 and a thermocouple 19 mounted on the wall of the cylinder 6.
Measuring ports are formed in the positions of the cylinder 6 at different heights, and the thermocouple 19 moves along the radial direction of the cylinder 6 through the measuring ports, so that the temperatures of liquid drops at different height positions and radial positions in the cylinder 6 can be measured.
The materials of the cylinder 6 and the coiled pipe 5 are copper so as to increase the cooling effect of the liquid nitrogen.
According to the experimental method of the liquid-drop flow radiation heat exchange experimental device, an air compressor 1 compresses air into an air storage tank 20, when the air pressure reaches a rated pressure, a valve of the air storage tank 20 is opened, high-pressure air firstly removes oil through an oil separator 2, then enters a pressure reducer 3 for pressure reduction, and enters a liquid nitrogen tank 4 when the air pressure is reduced to a set value, so that a high-pressure air phase region is formed at the upper part of the liquid nitrogen tank 4, liquid nitrogen in the liquid nitrogen tank 4 flows into a coiled pipe 5 on the outer wall of a cylinder 6, and the cylinder 6 is cooled by phase change heat absorption of the liquid nitrogen to form a low-temperature condition in the cylinder 6; when a first valve 13 between the high-level liquid tank 16 and the high-pressure nitrogen cylinder 12 is opened, the nitrogen cylinder 12 supplies gas, high pressure is generated at the upper part of the high-level liquid tank 16 for storing liquid drop working media, and the flow and the injection pressure of liquid drop flow 18 in the cylinder 6 are adjusted by adjusting a second valve 21 and a third valve 22 between the high-level liquid tank 16 and the piezoelectric ceramic 8; the second valve 21 and the third valve 22 are respectively used for realizing coarse adjustment and fine adjustment of the injection pressure of the liquid drop working medium so as to change the flow of the liquid drop working medium; the piezoelectric ceramic 8 can generate droplet flow 18 with different initial speeds according to different droplet working medium pressures at the upstream of the piezoelectric ceramic; the signal generator 11 generates an excitation signal, the excitation signal is amplified by the power amplifier 10 and then is transmitted to the piezoelectric ceramic 8, and the piezoelectric ceramic 8 makes simple harmonic motion according to the excitation signal, so that the liquid drop working medium is disintegrated into a liquid drop stream 18; according to the difference of the liquid drop working medium jetting pressure and the excitation signal, the piezoelectric ceramic 8 can generate liquid drop streams 18 with different diameters and liquid drop number densities; a heating wire 15 in the high-level water tank 16 heats the working medium, and the temperature and the pressure of a gas area on the upper part of the high-level water tank 16 are monitored by a temperature and pressure monitoring device 14 so that the working medium can reach the temperature and the pressure required by the experimental working condition; and (3) carrying out full-field measurement on the temperature of the droplet flow 18 in the cylinder 6 by adopting the thermal infrared imager 7 to obtain the temperature change trend of the droplet flow 18 in the flight process.
Compared with the prior art, the invention has the following advantages:
1) the temperature control system can effectively reduce the temperature of a test section and create a low-temperature environment, so that the heat radiation heat exchange characteristic of the liquid drop flow under the vacuum low-temperature condition can be researched;
2) the working medium driven by the pressurized nitrogen has stable pressure, which is beneficial to the accurate control of the flow rate of the liquid drop flow;
3) the invention can realize the full-field and local temperature measurement of the liquid drop flow and has high measurement precision.
Drawings
FIG. 1 is a schematic view of a droplet stream radiation heat exchange experimental apparatus of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in the attached figure 1, the liquid drop stream radiation heat exchange experimental device disclosed by the invention comprises a low-temperature environment simulation system, a liquid drop stream generation system and a temperature measurement system; the low-temperature environment simulation system comprises a main body, a coil pipe 5 is laid on the outer wall of a cylinder 6, liquid nitrogen is contained in the coil pipe 5 as a coolant, and heat insulation cotton 9 wraps the outer wall of the cylinder 6 and the periphery of the coil pipe 5; the low-temperature environment simulation system also comprises an air compressor 1, an air storage tank 20, an oil separator 2, a pressure reducer 3 and a liquid nitrogen tank 4 which are sequentially connected with the air compressor 1, wherein the liquid nitrogen tank 4 is communicated with the coiled pipe 5; the liquid drop flow generating system comprises a high-level liquid tank 16 for storing liquid drop working media, and a high-pressure nitrogen cylinder 12 communicated with the high-level liquid tank 16 through a first valve 13, wherein a second valve 21 is arranged at the outlet of the high-level liquid tank 16, a pipeline behind the second valve 21 is divided into two paths, one path is communicated with a cylinder 6, the other path is communicated with a water tank 17, a third valve 22 and a piezoelectric ceramic 8 are arranged at the communication position of the cylinder 6 and the high-level liquid tank 16, a power amplifier 10 and a signal generator 11 are connected with the piezoelectric ceramic 8, a liquid drop outlet at the bottom of the cylinder 6 is communicated with the water tank 17, and a heating wire 15 and a temperature and pressure monitoring device 14 are arranged in the high; the liquid drop working medium is pressurized by high-pressure nitrogen, and the liquid drop flow 18 flows out of the cylinder 6 and is collected into a water tank 17; the temperature measurement system comprises a thermal infrared imager 7 and a thermocouple 19 mounted on the wall of the cylinder 6.
In a preferred embodiment of the present invention, the cylinder 6 is provided with measuring ports at different heights, and the thermocouple 19 moves along the radial direction of the cylinder 6 through the measuring ports, so that the temperatures of the liquid drops at different height positions and radial positions in the cylinder 6 can be measured.
As a preferred embodiment of the invention, copper is selected as the material of the cylinder 6 and the coiled pipe 5 to increase the cooling effect of the liquid nitrogen.
As shown in fig. 1, in the experimental method of the liquid-drop flow radiation heat exchange experimental device, air is compressed into an air storage tank 20 by an air compressor 1, when the gas pressure reaches the rated pressure, a valve of the air storage tank 20 is opened, high-pressure air firstly removes oil by an oil separator 2, then enters a pressure reducer 3 for pressure reduction, and enters a liquid nitrogen tank 4 when the air pressure is reduced to a set value, so that a high-pressure gas phase region is formed at the upper part of the liquid nitrogen tank 4, and liquid nitrogen in the liquid nitrogen tank 4 flows into a coiled pipe 5 on the outer wall of a cylinder 6, and the cylinder 6 is cooled by phase change heat absorption of the liquid nitrogen, so that a low-temperature condition; when a first valve 13 between the high-level liquid tank 16 and the high-pressure nitrogen cylinder 12 is opened, the nitrogen cylinder 12 supplies gas, high pressure is generated at the upper part of the high-level liquid tank 16 for storing liquid drop working media, and the flow and the injection pressure of liquid drop flow 18 in the cylinder 6 are adjusted by adjusting a second valve 21 and a third valve 22 between the high-level liquid tank 16 and the piezoelectric ceramic 8; the second valve 21 and the third valve 22 are respectively used for realizing coarse adjustment and fine adjustment of the injection pressure of the liquid drop working medium so as to change the flow of the liquid drop working medium; the piezoelectric ceramic 8 can generate droplet flow 18 with different initial speeds according to different droplet working medium pressures at the upstream of the piezoelectric ceramic; the signal generator 11 generates an excitation signal, the excitation signal is amplified by the power amplifier 10 and then is transmitted to the piezoelectric ceramic 8, and the piezoelectric ceramic 8 makes simple harmonic motion according to the excitation signal, so that the liquid drop working medium is disintegrated into a liquid drop stream 18; according to the difference of the liquid drop working medium jetting pressure and the excitation signal, the piezoelectric ceramic 8 can generate liquid drop streams 18 with different diameters and liquid drop number densities; a heating wire 15 in the high-level water tank 16 heats the working medium, and the temperature and the pressure of a gas area on the upper part of the high-level water tank 16 are monitored by a temperature and pressure monitoring device 14 so that the working medium can reach the temperature and the pressure required by the experimental working condition; and (3) carrying out full-field measurement on the temperature of the droplet flow 18 in the cylinder 6 by adopting the thermal infrared imager 7 to obtain the temperature change trend of the droplet flow 18 in the flight process.
Claims (4)
1. The utility model provides a droplet stream radiation heat transfer experimental apparatus which characterized in that: the system consists of a low-temperature environment simulation system, a droplet flow generation system and a temperature measurement system; the low-temperature environment simulation system is characterized in that the main body of the low-temperature environment simulation system is a cylinder (6), the cylinder (6) is internally vacuumized, a coiled pipe (5) is laid on the outer wall of the cylinder (6), liquid nitrogen is contained in the coiled pipe (5) and serves as a coolant, and heat insulation cotton (9) is wrapped on the outer wall of the cylinder (6) and the periphery of the coiled pipe (5); the low-temperature environment simulation system also comprises an air compressor (1), and an air storage tank (20), an oil separator (2), a pressure reducer (3) and a liquid nitrogen tank (4) which are sequentially connected with the air compressor (1), wherein the liquid nitrogen tank (4) is communicated with the coiled pipe (5); the liquid drop flow generating system comprises a high-level liquid tank (16) for storing liquid drop working media, a high-pressure nitrogen cylinder (12) communicated with the high-level liquid tank (16) through a first valve (13), a second valve (21) is arranged at the outlet of the high-level liquid tank (16), a pipeline behind the second valve (21) is divided into two paths, one path is communicated with a cylinder (6), the other path is communicated with a water tank (17), a third valve (22) and piezoelectric ceramics (8) are arranged at the communication position of the cylinder (6) and the high-level liquid tank (16), a power amplifier (10) and a signal generator (11) are connected with the piezoelectric ceramics (8), a liquid drop outlet at the bottom of the cylinder (6) is communicated with the water tank (17), and a heating wire (15) and a temperature and pressure monitoring device (14) are arranged in the high-level liquid; the liquid drop working medium is supplied with pressure by high-pressure nitrogen, and the liquid drop flow (18) flows out of the cylinder (6) and is collected into a water tank (17); the temperature measuring system comprises an infrared thermal imager (7) and a thermocouple (19) which are arranged on the wall surface of the cylinder (6).
2. A droplet stream radiation heat exchange experimental facility as claimed in claim 1, wherein: the cylinder (6) is provided with measuring ports at different heights, and the thermocouple (19) moves along the radial direction of the cylinder (6) through the measuring ports, so that the temperatures of liquid drops at different height positions and radial positions in the cylinder (6) can be measured.
3. A droplet stream radiation heat exchange experimental facility as claimed in claim 1, wherein: the cylinder (6) and the coiled pipe (5) are made of copper so as to increase the cooling effect of the liquid nitrogen.
4. A method of testing a droplet stream radiation heat exchange test rig according to any one of claims 1 to 3, wherein: the air compressor (1) compresses air into an air storage tank (20), when the air pressure reaches the rated pressure, a valve of the air storage tank (20) is opened, high-pressure air firstly removes oil through an oil separator (2), then enters a pressure reducer (3) for pressure reduction, and enters a liquid nitrogen tank (4) when the air pressure is reduced to a set value, so that a high-pressure air phase region is formed at the upper part of the liquid nitrogen tank (4), and thus liquid nitrogen in the liquid nitrogen tank (4) flows into a coiled pipe (5) on the outer wall of a cylinder (6), and the cylinder (6) is cooled by utilizing phase change heat absorption of the liquid nitrogen, so that a low-temperature condition in the cylinder (6) is formed;
when a first valve (13) between a high-level liquid tank (16) and a high-pressure nitrogen bottle (12) is opened, the nitrogen bottle (12) supplies gas, high pressure is generated at the upper part of the high-level liquid tank (16) for storing liquid drop working media, and the flow and the ejection pressure of liquid drop flow (18) in a cylinder (6) are adjusted by adjusting a second valve (21) and a third valve (22) between the high-level liquid tank (16) and piezoelectric ceramics (8); the second valve (21) and the third valve (22) are respectively used for realizing coarse adjustment and fine adjustment of the ejection pressure of the liquid drop working medium so as to change the flow of the liquid drop working medium; the piezoelectric ceramic (8) can generate droplet streams (18) with different initial speeds according to different droplet working medium pressures at the upstream of the piezoelectric ceramic; the signal generator (11) generates an excitation signal, the excitation signal is amplified by the power amplifier (10) and then is transmitted to the piezoelectric ceramic (8), and the piezoelectric ceramic (8) makes simple harmonic motion according to the excitation signal, so that the liquid drop working medium is disintegrated into a liquid drop flow (18); the piezoelectric ceramic (8) can generate liquid drop streams (18) with different diameters and liquid drop number densities according to different liquid drop working medium jet pressures and different excitation signals; a heating wire (15) in the high-level liquid tank (16) heats the working medium, and the temperature and the pressure of a gas area on the upper part of the high-level liquid tank (16) are monitored by a temperature and pressure monitoring device (14) so that the working medium can reach the temperature and the pressure required by the experimental working condition;
and (3) carrying out full-field measurement on the temperature of the droplet flow (18) in the cylinder (6) by adopting a thermal infrared imager (7) to obtain the temperature change trend of the droplet flow (18) in the flight process.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112730510A (en) * | 2020-12-24 | 2021-04-30 | 西安交通大学 | Liquid drop radiation heat exchange experimental device and method |
| CN112933623A (en) * | 2021-02-05 | 2021-06-11 | 西南石油大学 | Experimental device for low-temperature dangerous medium droplet generation and droplet group evaporation simulation |
| CN115445531A (en) * | 2022-08-30 | 2022-12-09 | 嘉兴谱相科技有限公司 | Normal position pond system with portable temperature regulating device |
| CN117805180A (en) * | 2024-03-01 | 2024-04-02 | 中国人民解放军火箭军工程大学 | Liquid drop radiation heat dissipation experimental device and control method thereof |
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| CN112730510A (en) * | 2020-12-24 | 2021-04-30 | 西安交通大学 | Liquid drop radiation heat exchange experimental device and method |
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| CN112933623A (en) * | 2021-02-05 | 2021-06-11 | 西南石油大学 | Experimental device for low-temperature dangerous medium droplet generation and droplet group evaporation simulation |
| CN112933623B (en) * | 2021-02-05 | 2022-03-11 | 西南石油大学 | Experimental device for low-temperature dangerous medium droplet generation and droplet group evaporation simulation |
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